这一时期发生了许多重大事件。
有证据表明，这一时期发生了重大的生态和地质变化。
There is evidence of major ecological and geological changes during this period.
其中还包含有一个警报视图，用于在发生任何需要采取行动的重大情况时给我们以警示。
An alert view is included to notify us of any significant situations that need action.
其中还包含有一个警报视图，用于在发生任何需要采取行动的重大情况时给我们以警示。
An alert view is included to notify us of any significant situations that need action.
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